Microwave steamer base



FIG. 1 is a top, side and front perspective view of a microwave steamer base showing our new design;

FIG. 2 is a front elevation view, the rear elevation being identical thereto;

FIG. 3 is a right side elevation view, the left side elevation being identical thereto;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a bottom, side and rear perspective view thereof. 

The ornamental design for a microwave steamer base, as shown and described. 